Malicious PDF — malware analysis report

Static analysis result for SHA-256 f984538b95c5e412…

MALICIOUS

PDF

74.2 KB Created: 2021-01-21 19:12:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: df713caf9d8332ca5077d4e590716784 SHA-1: 968162c45b4183dd5d44aadb2f234a62477f3628 SHA-256: f984538b95c5e41280bf963a86761db39db4c922d0cb03c39f6fd9da622b5a9e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, some of which are hosted on disposable domains, and presents a visual download button. The embedded content, though largely unreadable, suggests a lure related to 'Ftk imager 4.2 manual', likely to trick users into downloading a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://maypoin.ru/123?utm_term=ftk+imager+4.2+manual PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4484605/normal_60090a90ad40f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500669/normal_5fd7c072eeee8.pdfIn PDF document text
    • https://site-1244778.mozfiles.com/files/1244778/duserajonepubiv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464072/normal_5fe28558d2a3a.pdfIn PDF document text
    • https://site-1178268.mozfiles.com/files/1178268/15917705297.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452837/normal_600720f2b61cc.pdfIn PDF document text
    • https://site-1176413.mozfiles.com/files/1176413/all_video_converter_apk_for_pc.pdfIn PDF document text
    • https://tipozuroboga.weebly.com/uploads/1/3/4/2/134265922/muxunodobu.pdfIn PDF document text
    • https://rizizisexulap.weebly.com/uploads/1/3/1/4/131407181/2587939.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368487/normal_5fd94c81c91fe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://watijosanowo.epizy.com/48058985312.pdfIn PDF document text
    • http://linakagiwabofa.epizy.com/palaxeziretusilug.pdfIn PDF document text
    • http://woxebolinos.rf.gd/pyrolysis_of_biomass.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE459 5096 bytes
SHA-256: a40e88a73330331871bf9499938e7c7ade78113871bd80bcdfa983e1d46551eb
font_01_sfnt_off0000f5ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AD 11032 bytes
SHA-256: 9443dcc0dbab168cb04246ff5f2406ad98afca826e5c601850e96ec6f7e00766

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